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Dispositions (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 15, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Partners' Capital Account, Units   23,160,551 23,137,695 31,811,849
Asset Purchase Agreement [Member]        
Business Acquisition [Line Items]        
Transaction costs, general and administrative expense     $ 0.5  
Green Plains Inc. [Member] | Asset Purchase Agreement [Member]        
Business Acquisition [Line Items]        
Total consideration received $ 120.9      
Partners' Capital Account, Units 8,692,736      
General partner's interest 2.00% 2.00%    
Additional consideration received $ 2.7      
General Partner [Member] | Asset Purchase Agreement [Member]        
Business Acquisition [Line Items]        
Partners' Capital Account, Units 177,403